Sawmill-carriage



(No Model.)

W. M. WILKIN.

SAWMILL CARRIAGE.

No. 559,428. Patented May 5, 1896.v

SU r f Nrrnn STATES ATENT FFICE SAWMILL-CARRIAG E.

SPECIFICATION forming part of Letters Patent No. 559,428, dated May 5,1896.

Application filed April 2,5, 1895. Serial No. 547,084. (No model.)

To @ZZ whom, t may concern:

Be it known that I, WILLIAM M. WILKIN, a citizen of the United States,residing at Erie, in the county of Erie a-nd State of Pennsylvania, haveinvented certain new and useful Improvements in SaWmill-Carriages; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to sawmill-carriages; and it consists in certainimprovements in the construction thereof, as will be hereinafter fullydescribed, and pointed out in the claim.

More particularly my invention relates to a set-off mechanism forsawmill-carriagest'. e., a mechanism for moving the carriage to and fromthe saw.

The invention is illustrated in the accompanying drawings as follows:

Figure l shows a plan of a fragment of a carriage, showing myimprovements thereon. Fig. 2 is anelevation of the same parts. Fig.

`3 is a section on the line 3 3 looking from the left. Fig. 4. is anenlarged view of the friction mechanism. Fig. 5 is a section on the line5 5 in Fig. L

A marks the carriage side; A, the crossgirths ,A2, a head-block; o, theaxle-boxes; B, the axles; B', the carriage-wheels, and C the track.These parts are as commonly made.

Brackets I) are bolted on the inside of the carriage side over theaxles. Studs d with collars d are passed through perforations in thebrackets and secured in place by nuts d3 on top. One of theperforations, as cl2, is elongated, so the stud therein may bepositioned to or fromV its companion, to take up wear of parts,hereinafter described. On the studs below the collars d are rollers d4,which are secured in place by nuts This mechanism forms what may betermed cam-posts fixed with the carriage.

On the axle just below the bracket is a sleeve E, having collar E at theinner end, preferably integral therewith, and this sleeve is fixed withthe axle by means of set-screws e. Journaled on this sleeve is africtionsleeve F, which is held in place thereon by a collar H, securedwith setscrews h. A spiral cam-segment is carried by and turnswith thesleeve F, and turns between the rollers d4. The cam-segment has stops g,provided with stop cushions g', which contact the brackets and so limitthe movement of the cam-segment.

It will be readily seen that as the spiral cam is turned, it beinglocked against side movement on the axle, it will move the carriagesidewise on the axle to the extent of the throw of the spiral cam, andso accomplish the offset movement. While I prefer the true spiralcam-segment it will be operative if perfectly fiat and set at an angle,as shown in the drawings, the only requirement being that one end of thesegment be nearer the carriage side than the other.

To eifect the turning of the cam-segment, the following frictionmechanism is provided At one side of the friction-sleeve there is ahollow enlargement f, in which is a frictionplate f', lined withfriction material f2. Back of the friction-plate is a spring f3, thetension of which is adjusted by a screw f4. The friction formed by theplate f is sufficient to start the cam, so that when the carriage isreversed the cam is turned with the axle tothe limit of its movement.The direction of the throw of the cam is such as to move the carriagefrom the saw on the back or reverse movement and to the saw on theforward movement. As soon as the cam starts the sleeve F is crowdedendwise against either the collar E or I-I, according to the directionthe carriage is moving, and this end thrust creates a friction, whichassists materially in the further movement of the cam.

Extending below the friction-sleeves .are arms F', which are connectedby a connecting-rod I, so that both mechanisms are controlled to move-in unison, keeping the earriage parallel to the saw at all times.

A collar i is placed on the connecting-rod, and a throated lever J,carried by a rod j, is adapted to engage said collar. A hand-lever J' isplaced on the rod j for operating the lever J. When it is desired toback the saw out of a log, the lever J is thrown against the collar 't'and held with sufficient force to overcome the friction of theoffsetting mechanism and so locks the carriage against the offsetmovement until released.

IOO

Vhat I claim as new istively to said cam as to be contacted thereby 1oIn a Sawmill-carriage, the combin ation with in its movement. the frame;and the axle thereof; of a friction- In testimony whereof I affix mysignature sleeve journaled on a bearing moving` With the in presence oftwo Witnesses. 5 aXle, and having a hollow enlargement thereon; afriction-plate Within said enlargement; WILLIAM M. WILKIN. means ofadjusting said plate; a cam-segment Ttnessesz carried bysaidfriction-sleeve and cam-posts II. A. STRONG,

fixed with the carriage-frame so placed rela- J. KEESE HALLOCK.

